
Onboarding at Scale
Onboarding New Engineers to Large Underdocumented Legacy Codebases
Senior engineers are the real bottleneck when onboarding new hires to legacy code.
Damilola Osei-Bonsu · October 13, 2026 · 10 min read
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A publication for engineering leaders on the structural and organizational fractures that emerge as codebases, teams, and processes grow fas








Senior engineers are the real bottleneck when onboarding new hires to legacy code.

New engineers onboard faster when codebase navigation tools answer questions independently.

Codebase navigation, not access or task clarity, is what actually delays new hires.